1、Designation: D3482 07a (Reapproved 2014)Standard Practice forDetermining Electrolytic Corrosion of Copper by Adhesives1This standard is issued under the fixed designation D3482; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the y
2、ear of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This practice covers the
3、determination of whether anadhesive has any corrosive effect on copper. It is ordinarilyintended to distinguish materials that might cause corrosion inelectrical and electronic equipment. This procedure is a sub-jective test for which precision and accuracy have not beenestablished. It is not recomm
4、ended for adhesives on backing.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of
5、 this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D907 Terminology of AdhesivesD996 Terminology of Packaging and Distribution Environ-mentsE104 Practice for Maintaini
6、ng Constant Relative Humidityby Means of Aqueous SolutionsG15 Terminology Relating to Corrosion and Corrosion Test-ing (Withdrawn 2010)33. Terminology3.1 DefinitionsDefinitions of terms in this test methodmay be found in Terminologies D907, D996, and G15.3.1.1 electrolytic corrosion, nthe corrosion
7、of metal re-sulting from current flow under an electrical potential in thepresence of moisture.4. Summary of Practice4.1 Two parallel helices of fine copper wire are laid inetched grooves on a glass tube. The adhesive material is coatedover the wires and the tube and then allowed to set or cure. The
8、wired tube is exposed to high humidity with a d-c potentialapplied between the wires. Corrosion products are observedvisually.5. Significance and Use5.1 Adhesives can be exposed to both electrical potentialand humidity in many electrical and electronic applications. Itis therefore desirable to provi
9、de a means of examining thecorrosive tendencies of certain adhesives towards metals.5.2 Although electrolytic corrosion is a direct result of ionicconduction in the adhesive, the nature of the exposed metalswill have a bearing on both the severity of metal attack and thevisibility of corrosion produ
10、cts. Because it gives a visualindication of corrosion and because of its widespread use inelectrical circuits, copper is used in this practice. However, thiswould not preclude the use of other metals for specificinterests.5.3 This procedure is a subjective test in that determinationsof the presence
11、of corrosion is based on a visual inspection fora green discoloration or other evidence of corrosion.6. Apparatus and Material6.1 Motor (Optional), low-speed, approximately 10 r/minfor winding wire helices.6.2 Oven (or Temperature-Controlled Chamber),circulating-air, or chamber controlled at 39.5 6
12、1C (95 62F), unless otherwise specified.6.3 Battery, 45-V, or equivalent source of d-c power.6.4 Corrosion Test ApparatusSee Fig. 1.6.4.1 Helically Etched Glass TubingSee Fig. 2.6.4.2 Wire, No. 36 Awg, 0.13 mm (0.005 in.) in diameter,OFHC (Oxygen-Free High-Conductivity) bare copper wire.1This practi
13、ce is under the jurisdiction of ASTM Committee D14 on Adhesivesand is the direct responsibility of Subcommittee D14.80 on Metal BondingAdhesives.Current edition approved March 1, 2014. Published March 2014. Originallyapproved in 1976. Last previous edition approved in 2007 as D3482 07a. DOI:10.1520/
14、D3482-07AR14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical st
15、andard is referenced onwww.astm.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.4.3 Test Tube, borosilicate glass, 32 mm (112 in.) inoutside diameter, 200 mm (8 in.) long.6.4.4 Rubber Stopper, No. 6, neoprene.6.5 MiscellaneousSo
16、ldering iron, rosin-core solder, thinpolyethylene film, insulated wire, etc.7. Procedure7.1 Rinse a chemically cleaned helically etched glass tubewith distilled water and air dry. Keep clean until ready for use.7.2 Clean copper wire by immersing in fresh methyl ethylketone and wiping with clean, lin
17、t-free cloth. When materialsare cleaned, handle them only with clean white gloves, cleantongs, or other suitable implements.7.3 Attach the tube to the motor drive shaft and manuallylay the wire around the small knobs on the tube. Repeat withanother length of wire in the adjacent groove. Avoid excess
18、tension on the wire as this may lead to drawing.7.4 Cover one end of the tube with a thin film ofpolyethylene, roughly 75 mm (3 in.) to 100 mm (4 in.) across,and insert the tube into a 16-mm (58-in.) inside diameter by13-mm (12-in.) deep hole centered in the small end of aneoprene stopper.7.5 Make s
19、older connections of the helically wound wires todiametrically opposed connecting posts inserted in the neo-prene stopper (Note 1). Clip excess wire from the opposite endof the tube.NOTE 1Short lengths of 14-gauge tinned copper wire have workedsatisfactory as connecting posts.7.6 Apply two thin unif
20、orm applications of the test adhesivein approximately 6-mm (14-in.) wide uniform stripes of thematerial to be tested 180 apart over the entire exposed lengthof the test apparatus. Allow the material to set or cure inaccordance with the manufacturers recommendations.7.6.1 For adhesive systems which a
21、re air-inhibited or con-tain volatile, reactive constituents, wrap the test apparatus witha suitable nonadherent, inert film. Polyethylene,polypropylene, TFE-fluorocarbon, or similar films may beused. For air-inhibited adhesive systems, polyethylene andpolypropylene are not recommended. If one of th
22、ese films isused to cover the test adhesive, remove the nonadherent filmfrom the test apparatus after the adhesive system has set orcured and before subjecting the specimen to humidity expo-sure.NOTE 2For extremely critical applications, room- and moderatetemperature curing adhesives may be subjecte
23、d to the testing environmentduring cure if mutually agreed.7.7 Control temperature and relative humidity, whenspecified, in accordance with Practice E104, Method C.NOTE 3For example, for 96 % relative humidity at 35C (95F) place2to3gofpotassium sulfate in a test tube and cover with a saturatedsoluti
24、on of the same salt in distilled water to about a 25-mm (1-in.) depth.7.8 Before placing the assembly in the test tube, the externalleads should be temporarily connected to the d-c voltagesource, and then the leads of a d-c voltmeter should be touchedto the bottom ends of the two test wires on the c
25、oated tube toFIG. 1 Corrosion Test ApparatusFIG. 2 Glass TubeD3482 07a (2014)2check that the applied voltage is present throughout the testwires under the adhesive.7.9 Insert the wired, coated tube and rubber stopper in thetest tube, keeping the polyethylene film between the rubber andwire leads.7.1
26、0 Place the tube in the oven or temperature-controlledchamber and connect the leads externally to a 45-V battery orequivalent power source.7.11 Examine the wires visually with the aid of a 5-powermagnifying glass for green discoloration or other visibleevidence of corrosion. Observe at the end of 1
27、and 3 days, andperiodically thereafter up to 15 days, or for the period of timespecifically required. Use blanks of known corrosive or non-corrosive controls.8. Report8.1 Report the following where applicable:8.1.1 Description of curing agents or additives,8.1.2 Formulation,8.1.3 Method of setting o
28、r curing (including description ofcovering film),8.1.4 Temperature and humidity of test,8.1.5 Period of exposure for each examination,8.1.6 Observation notes,8.1.7 Indication of whether positive or negative wire wasinvolved, and8.1.8 Indication of location(s) of wire corrosion, that is, (a)on portio
29、ns of wire free of adhesive, (b) under adhesivecoating, (c) at air-wire-adhesive interface.9. Precision and Bias9.1 Precision and bias statements for this practice cannot beestablished, because the test is subjective. The visual interpre-tation of the presence of corrosion is a judgement evaluation,
30、and is not a practical basis for statements of this nature.10. Keywords10.1 adhesives; copper; corrosion; electrolyticASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly
31、 advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, ei
32、ther reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may atten
33、d. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. In
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